Some teachers don’t like to use laser pointers in the class

Some teachers don’t like to use laser pointers in the class.
Place the third layer is called the charge layer, is responsible for receiving laser irradiation produces electron-hole pairs; the fourth layer is called the charge transport layer is responsible for conduction charge; fifth layer is the protective layer and increase the wear resistance of the drum, this layer is optional. General drum at least the first aluminum layer, the second layer charge layer occurs, the third layer charge transport layer, this three-tiered structure is essential. We often hear the drums drum with cold and hot drum, in fact, refers to the level of sensitivity of the photosensitive drum, the drum sensitivity refers to the light of a certain degree of sensitivity, its potential use after receiving the light down to half the required energy of Countdown said. Excessive light damage suffered by the drum coating color will change, that you can observe the changes in color drum to determine the re-use of the drum; prolonged use of the photosensitive drum surface wear, indicating the depth of the line drum wear, excessive wear of the photosensitive drum, the coating has become very thin, reduced ability to withstand the charge, that charge potential to reduce, print materials lighter, more seriously, there will be bottom ash, generally the two ends of the drum first appear; drum coatings with different shades of the scratch will be reflected in the printed product, from black to white spots on the version of the white version of the black spots, can be used to see your print product requirements, and because the scratch is local and does not represent the entire drum life. In recent years, due to high-tech in continuous use in laser printers, printer growing degree of integration, with the rapid increase in electronic control technology, laser printers, the structure will be more simple. However, the board adopted a number of integrated circuits, to increase the difficulty of maintenance work and technical content. In addition, laser printers generally do not provide random data circuit drawings, and some integrated chip failure No information was available. This kind of laser pointers looks fashionable.Paper trail spilled toner: When printing the back of goods and produce Dirty with vertical black lines, the paper trail that the machine has toner spilled. In short, the need to remember is that the quality of printed products and toner cartridges not only on but also closely related with the machine, first categorized according to type of defect, be targeted for inspection.Wear and tear on the parts toner: toner on the relevant parts are worn, imaging and non-image areas are exposed to wear and tear is different, even though every day dealing with the same print job is not much, but we need to know this circumstances the use of components is the most unreasonable.